Agar plates are used to germinate spores, isolate mycelium away from contamination and to expand mycelium. Agar is a very nutritious gel that has been sterilized and then poured into petri dishes. These dishes are completely sterile to allow for mycelium to rapidly grow without contamination.
Our agar is a mixture of agar-agar and dried malt extract (DME). We can also include a color to help in seeing growing mycelium.
Working with agar is generally considered more advanced and requires a sterile environment to work in. However, a sterile environment could simply be an enclose clear tote (still air box or SAB).